W. Hu et al., TRANSPORT AND HIGH-SELECTIVITY MECHANISMS OF C-4 HYDROCARBONS THROUGHANHYDROUS AG-DOPED PERFLUOROCARBON-TYPE ION-EXCHANGE MEMBRANES(), Journal of the Chemical Society. Faraday transactions, 94(5), 1998, pp. 665-671
Citations number
24
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Permeation experiments have been carried out for n-butane, but-1-ene a
nd isobutene through anhydrous Ag+-doped perfluorosulfonate membranes
from an AgBF4 aqueous solution. The anhydrous Ag+-doped perfluorosulfo
nate membranes are microporous and n-butane hows through the microporo
us channels in these membranes in the gas phase. On the other hand, th
e transport of but-1-ene and isobutene is mainly controlled by hydrody
namic surface flow. Both the permeability of alkenes and the ideal sel
ectivity of alkene/alkane increased with the increase in upstream gas
pressure. The highest ideal separation factor is 2500 for but-1-ene/n-
butane and 810 for isobutene/n-butane, indicating that anhydrous Ag+-d
oped PSM membranes are applicable for the separation of alkenes and al
kanes. The ideal separation factor of 7.9 is also obtained for but-1-e
ne/isobutene.